When is it good to weed the wheat? You should pay attention to these misunderstandings!

Every winter or spring, a large number of weeds will grow in the wheat field, seriously affecting the growth of wheat. Therefore, how to weed is the most concerned issue for farmers. When is the good time for wheat weeding? These misunderstandings need to be noticed!

When is the good time for weeding wheat?

1. Years ago: wheat seedling stage (mid-late November)

2. Years later: during the period of returning to youth (from late February to early March)

Also note: medication is recommended between 10:00 and 3pm, the temperature is relatively high.

2. Weeding in wheat fields should not enter these 8 misunderstandings.

1. No herbicides are used before and after the fourth leaf of wheat.

Most wheat field herbicides are used after 4 leaves and are stopped at the jointing stage of wheat. Before the 4-leaf stage, wheat is relatively delicate, detoxification ability and immunity are low, and it is easy to produce drug harm; after jointing stage, wheat enters the booting stage, which is also the most fragile and critical period in life, when using herbicides is very easy to produce drug harm. sometimes it will cause wheat ear can not be pulled out or deformed, seriously affecting the final yield, in addition to chlorofluoropyloxyacetic acid herbicides can be halved after jointing, other herbicides had better not try!

2. no herbicides are used when the daily average temperature is below 8 degrees

Except for a few herbicides (difluorosulfonamide, more resistant to low temperature), general herbicides are not ideal in low temperature weather, and are easy to cause drug damage. Therefore, it is best to use the medicine when the daily minimum temperature is above 8 degrees, and the higher the temperature is, the better the weeding effect is, because the weeds absorb light and grow vigorously, the stomata are open, and it is easy to absorb water and liquid, but the opposite is true when the temperature is low.

3. No herbicides are used in dry weather

In addition to looking at the temperature, the herbicide should also grasp the soil moisture. In the case of serious drought, it is necessary to seize the opportunity of watering the wheat field and apply the herbicide in time to ensure the effectiveness of the herbicide. The effectiveness of most herbicides requires a certain amount of soil moisture. When the soil moisture is 40%-60%, it is most beneficial to the efficacy of herbicides.

4. Herbicides are not used when wheat seedlings are weak and roots are exposed.

In general, straw will be returned to the field in winter wheat fields, and the plots are relatively loose. if you encounter abnormal weather years (such as warm winter and drought), the roots of wheat may be too loose to tie deeply, or part of the roots may be exposed. Such wheat is easy to cause frostbite and lack of water, and is more sensitive and fragile, if herbicides are easy to cause damage to wheat at this time.

5. Herbicides are not used when wheat diseases occur.

In recent years, wheat sheath blight, root rot, total erosion disease and other seed-borne or soil-borne diseases occur frequently, and the resistance of diseased wheat is very low. Once drug damage occurs, it is not easy to recover, so it is generally not recommended to use herbicides in seriously sick wheat plots.

6. Do not use herbicides before and after heavy rain and before the arrival of cold air

On the one hand, the use of herbicides before and after heavy rain and cold air affects the effect of weeding, on the other hand, it is easy to cause drug damage. The use of herbicides is prohibited in severe weather such as frost, rain and snow, hail and cold snap, which belong to bad weather, especially in the 7 days before the cold in late spring, so pay more attention to the weather forecast in winter.

7. No herbicides are used 7 days before and after the use of organophosphorus and carbamate pesticides.

As we all know, it takes an interval of seven days to use herbicides in corn fields after treatment with organophosphorus or carbamate pesticides, while it takes at least seven days to use herbicides in wheat fields. Otherwise, it is easy to cause wheat yellowing and leaf burning, because organophosphorus pesticides reduce the ability of wheat to degrade herbicides, followed by the use of herbicides.

Do not re-spray or leak spray

The use of herbicides must be uniform spray, if there is a leak or less spray, weeds are uneven, the control effect is not good; secondly, remember not to re-spray, will cause wheat yellowing, easy to cause herbicide damage.

What are the benefits of weeding wheat before winter?

Wheat weeding before winter refers to the field weeding carried out before the Winter Solstice's solar terms (before the wheat enters the overwintering period). There are mainly the following advantages:

1. The drug resistance of grass is poor, which is beneficial to the effect of medicine.

2. The seedlings are easy to spray, there is no covering between the leaves, the liquid can be sprayed on the weeds, and the amount of medicine and water is less.

3. It has no effect on the rapid growth of wheat seedlings after the year, and is safe for the next crop.

The above is the introduction of the time and misunderstanding of wheat weeding. I hope it will be helpful to you!